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Message-ID: <000000000000194b2a057eeca129@google.com> Date: Mon, 07 Jan 2019 22:41:03 -0800 From: syzbot <syzbot+0864346ae616fffdd602@...kaller.appspotmail.com> To: davem@...emloft.net, herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com Subject: general protection fault in ipcomp_init_state Hello, syzbot found the following crash on: HEAD commit: b71acb0e3721 Merge branch 'linus' of git://git.kernel.org/.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=17f383bb400000 kernel config: https://syzkaller.appspot.com/x/.config?x=b03c5892bb940c76 dashboard link: https://syzkaller.appspot.com/bug?extid=0864346ae616fffdd602 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0864346ae616fffdd602@...kaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access sit: non-ECT from 172.20.255.187 with TOS=0x1 general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 25310 Comm: syz-executor0 Not tainted 4.20.0+ #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:strcmp+0x3a/0xb0 lib/string.c:328 Code: 41 55 41 54 53 48 89 fb 48 83 ec 08 eb 08 45 84 e4 74 5f 4c 89 ee 48 89 df 48 83 c3 01 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 30 38 d0 7f 04 84 c0 75 54 44 0f b6 63 ff 4c 8d 6e 01 RSP: 0018:ffff88806190f3b0 EFLAGS: 00010246 RAX: 0000000000000007 RBX: 0000000000000039 RCX: 1ffff11010bdaced RDX: 0000000000000000 RSI: ffff88809c33d000 RDI: 0000000000000038 RBP: ffff88806190f3d8 R08: ffff8880642ba040 R09: fffffbfff1478e45 R10: ffff88806190f3d8 R11: ffffffff8a3c7227 R12: dffffc0000000000 R13: ffff8880a6199380 R14: dffffc0000000000 R15: ffff88806190f4a8 FS: 00007f6f19d31700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002908c10 CR3: 0000000090cb7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:288 [inline] ipcomp_init_state+0x244/0xbc0 net/xfrm/xfrm_ipcomp.c:363 ipcomp4_init_state+0x10d/0xb10 net/ipv4/ipcomp.c:137 __xfrm_init_state+0x62a/0x1060 net/xfrm/xfrm_state.c:2302 xfrm_init_state+0x1e/0x80 net/xfrm/xfrm_state.c:2328 pfkey_msg2xfrm_state net/key/af_key.c:1307 [inline] pfkey_add+0x1da8/0x3180 net/key/af_key.c:1524 pfkey_process+0x6d2/0x810 net/key/af_key.c:2844 pfkey_sendmsg+0x5bb/0xfc0 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 sit: non-ECT from 172.20.255.187 with TOS=0x1 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 kobject: 'loop3' (00000000958bbf02): kobject_uevent_env RSP: 002b:00007f6f19d30c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6f19d316d4 R13: 00000000004c5305 R14: 00000000004d8d70 R15: 00000000ffffffff Modules linked in: ---[ end trace b27bff8084733df2 ]--- kobject: 'loop3' (00000000958bbf02): fill_kobj_path: path = '/devices/virtual/block/loop3' RIP: 0010:strcmp+0x3a/0xb0 lib/string.c:328 kobject: 'loop4' (00000000a9a61426): kobject_uevent_env Code: 41 55 41 54 53 48 89 fb 48 83 ec 08 eb 08 45 84 e4 74 5f 4c 89 ee 48 89 df 48 83 c3 01 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 30 38 d0 7f 04 84 c0 75 54 44 0f b6 63 ff 4c 8d 6e 01 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. netlink: 'syz-executor1': attribute type 1 has an invalid length. kobject: 'loop4' (00000000a9a61426): fill_kobj_path: path = '/devices/virtual/block/loop4' sit: non-ECT from 172.20.255.187 with TOS=0x1 netlink: 'syz-executor1': attribute type 1 has an invalid length. kobject: 'loop1' (0000000079f16328): kobject_uevent_env RSP: 0018:ffff88806190f3b0 EFLAGS: 00010246 kobject: 'loop1' (0000000079f16328): fill_kobj_path: path = '/devices/virtual/block/loop1' RAX: 0000000000000007 RBX: 0000000000000039 RCX: 1ffff11010bdaced kobject: 'loop2' (00000000ab521588): kobject_uevent_env sit: non-ECT from 172.20.255.187 with TOS=0x1 RDX: 0000000000000000 RSI: ffff88809c33d000 RDI: 0000000000000038 kobject: 'loop2' (00000000ab521588): fill_kobj_path: path = '/devices/virtual/block/loop2' netlink: 'syz-executor1': attribute type 1 has an invalid length. RBP: ffff88806190f3d8 R08: ffff8880642ba040 R09: fffffbfff1478e45 kobject: 'loop2' (00000000ab521588): kobject_uevent_env kobject: 'loop2' (00000000ab521588): fill_kobj_path: path = '/devices/virtual/block/loop2' R10: ffff88806190f3d8 R11: ffffffff8a3c7227 R12: dffffc0000000000 R13: ffff8880a6199380 R14: dffffc0000000000 R15: ffff88806190f4a8 kobject: 'loop1' (0000000079f16328): kobject_uevent_env FS: 00007f6f19d31700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 kobject: 'loop1' (0000000079f16328): fill_kobj_path: path = '/devices/virtual/block/loop1' CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000070a158 CR3: 0000000090cb7000 CR4: 00000000001406e0 kobject: 'loop5' (00000000a2544941): kobject_uevent_env DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject: 'loop5' (00000000a2544941): fill_kobj_path: path = '/devices/virtual/block/loop5' --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.
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